Mineral, Part Of A Rock

Likely quartz-bearing mineral aggregate

Quartz (SiO₂), possibly mixed with mica or feldspar

Note: This is a Man-Made Object (Costume/Prop Patch)

Synthetic fiber and pigments (Cellulose/Plastic-based composite)

Milky Quartz

Silicon Dioxide (SiO2)

Hematite / Jasper

Iron(III) oxide (Fe2O3) in Quartz (SiO2)

Sandstone Chert/Quartzite

Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Granite (likely granitic gneiss or granodiorite)

Granitoid; chiefly quartz, feldspar, and biotite/hornblende

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Rounded dark-gray pebble, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly plagioclase ± pyroxene, amphibole, and minor olivine

Ferruginous Quartz (Red Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartz Druze on Matrix (Geode Fragment)

Quartz (Silicon Dioxide, SiO2)

Red Quartzite / River Siltstone

Quartzite (SiO2 with iron oxide inclusions)

Amethyst cabochon jewelry

Amethyst, purple variety of quartz (SiO₂)

Granite

Granite (Mainly SiO2 and Al2O3)

Quartz-rich granite pebble

Granite, composed mainly of quartz, feldspar, and mica

Rounded beach pebble, likely fine-grained sandstone or siltstone

Indeterminate sedimentary lithic fragment; exact identification requires examination

Granite

Granite

Sandstone

Arenite (SiO2 primarily)

Reddish-brown sandstone pebble

Quartz-rich sandstone, commonly ferruginous sandstone (SiO₂-dominated)

Quartzite Pebble

Quartzite (primarily SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Schist

Mica Schist

Fossil sea urchin (echinoid)

Fossilized echinoid test, likely a regular sea urchin (Class Echinoidea); exact genus and age require locality and examination

Quartz-rich granitic rock, possibly weathered pegmatite

Granite or pegmatitic quartz–feldspar aggregate; mainly SiO₂ quartz with K-feldspar/plagioclase and minor mica

Granite Quartz Blend (Pegmatite or Quartz-rich Granite)

Igneous rock composed primarily of SiO2 (Quartz) with KAlSi3O8 (Feldspar) and (K,Fe,Mg)3(Al,Si4O10)(OH)2 (Biotite)

Quartz-rich granite or granitic gneiss fragment

Granite, primarily quartz (SiO₂), feldspar, and minor mica; possibly weakly foliated gneiss

Fossilized trilobite

Trilobita; likely an enrolled asaphid or phacopid trilobite

Fossilized Coral (Petoskey Stone or similar)

Hexagonaria percarinata (Order: Rugosa)

Weathered gray metamorphic rock, likely schist or gneiss

Micaceous quartz-feldspar schist/gneiss; exact identification requires a fresh surface and testing

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Pink Granite

Granite (Alkali-feldspar granite)

Weathered basaltic rock

Basalt, likely altered basalt (plagioclase–pyroxene ± olivine; possible iron-oxide staining)

Quartzite River Rock

Quartzite (SiO2)

Weathered granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspars, and biotite/muscovite mica

Basalt with Amygdaloidal Infilling

Porphyritic or Amygdaloidal Basalt

Quartz (Rose/Milky variety)

Silicon Dioxide (SiO2)

Weathered sandstone or iron-stained quartzite pebble

Likely quartz-rich sandstone (mostly SiO₂), possibly weakly metamorphosed quartzite

Uncertain pale granitoid or weathered feldspathic rock

Likely granite or granodiorite; chiefly quartz, feldspar, and minor mica, but the photograph is insufficient for precise identification.

Rounded granite pebble

Granite, chiefly quartz, potassium feldspar, and plagioclase with minor mica or amphibole

Dyed Quartz Crystal

Silicon Dioxide (SiO2) with artificial pigment